Ed Sheeran has sold out arenas across the world, but there was not a fan in the house when he debuted his acoustic song “One” live to an empty Wembley Arena in London.

The song is the first he penned for his sophomore album x, due June 23.

“I wrote it back in 2011 in Perth, on a guitar made out of a whiskey barrel,” said the British singer. “My first album was mostly about one person—this song is the last one about them. The rest of x is about moving on and the incredible experiences I’ve had since then. I can’t wait for you guys to hear it!”